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In this paper, a new parameter tuning method based on D decomposition method and dominant pole placement is proposed for the complex problems such as design parameters of two-degree-of-freedom fractional PID controllers and complicated structure. The basic principle is to first configure the dominant pole based on dynamic response index constraints, and to determine the system overshoot and adjustment time under the condition of ensuring good response characteristics of the closed-loop system, and then obtain the functional relationship between unknown parameters through conversion. Secondly, the D decomposition method is used to reduce the unknown parameters by more than one without affecting the control performance, and then optimize the related parameters to obtain stable system performance in the parameter domain. Finally, guided by the differential evolution algorithm, the two methods are used. The relevant constraint condition for the index is to obtain the optimal controller parameters, and the designed controller can achieve the desired control performance under the advantage of ensuring the selected pole. Finally, the designed controller is applied to the integer and fractional order controlled objects, and the simulation is used to verify the robustness and rapidity of the new method. At the same time, it also shows the effectiveness and practicability of the new method.